isl_union_*_extract_*: ignore parameters when looking up entry
isl_union_*_extract_*: ignore parameters when looking up entry

Since isl_union_*_find_entry no longer requires the parameters to match,
the space argument no longer needs to be adjusted first.

Note that since the space is no longer modified to have
its parameters match those of the union expression,
the empty (or zero) base expression returned in case there is no entry
will now have the parameters of the space argument
instead of those of the union expression argument.

Signed-off-by: Sven Verdoolaege <235c10dd23b819f81cdc9756a251746bc184cab6@gmail.com>

Meinersbur/isl,Meinersbur/isl,Meinersbur/isl,Meinersbur/isl